Lagoon Boy is a male Atlantean with amphibious adaptations. He has green skin, red eyes and webbed ears, claws and feet. He has dark green fins on his head, the ends of which he has tied on a pony tail. He wears black shorts, and a black pouch around his ankle.

In his "puffer mode"[6] his body is inflated like a puffer fish, with glowing mystic tattoos on his arms.

When he was younger, La'gaan was an eager student who wanted to know a lot about the surface world.[1]

He eventually adopts his superhero sobriquet, Lagoon Boy, inspired in part by his first name, as well as the movie "Creature from the Black Lagoon".

By 2016, his demeanor was still easy-going during more casual situations. However, he has shown frustration at the lack of action he receives during field missions and has demonstrated times of aggressive impulsiveness when it comes to battle. He often uses Atlantean slang and euphemisms in his speech; he is especially fond of using "Neptune's Beard", and calling people who he does not particularly like as "Chum". Some, like Superboy, consider him a jerk, a feeling that La'gaan seems to return, mostly out of apparent jealousy in regards to the past relationship Superboy and Miss Martian shared.

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